Telephone lock



Nov. 30 1926.

C. G. KOCH TELEPHONE LOCK Filed July 6. 1926 rm .w /9 l 5 6. Each amocmtoz Patented Nev. 39, 1926.

PATENT OFFICE,

CHARLES GEAN KOCH, F AUSTIN, TEXAS.

rnnnrnonn LOCK.

Application filed July 6, 1926.

This invention relates to a lock designed primarily for use in connection with telephones, one of the objects of the invention being to provide a means whereby use of the telephone can be prevented unless a proper key is inserted into the lock and the lock shifted.

Another object is to provide a device of this type which can be applied readily to telephones of the type already in use.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts, and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed, without eeparting from the spirit of the invention. El

In the. accompanying drawings the pre ferred form of the invention has been shown.

In said drawings,

Figure 1 is a view partly in elevation and partly in section of a telephone transmitter having the present improvements combined therewith.

Figure 2 is a section through a portion of the standard of the transmitter and showing the lock in released position.

Figure 3 is a section on line 33, Figure 2.

Referring to the figures by characters of reference 1 designates the usual base, 2 the tubular standard, and 3 the mouth-piece of a telephone transmitter of the ordinary type, there being located within this structure separate contacts 4 and 5 for controlling the call or bell circuit and the talking circuit respectively. In the structure illustrated a spring 6 is extended between the two pairs of contacts and is adapted to be held by the weight of the hook 7 and receiver 8 so as to maintain the contacts at normally together. As is Well known to those skilled in the art the removal of the receiver 8 will permit the hook 7 to swing upwardly and the spring 6 will break the bell circuit at the contacts 4 while the other circuit will be closed by bringing the contacts 5 together.

The present invention comprises a lock which, when applied to the standard 2, can be used for holding the spring 6 against movement When the receiver is taken from the hook 7. This lock includes a housing Serial No. 120,754.

9 having a recess space 10 from which eX- tend wings 11. These wings can be riveted, welded or otherwise attached to the standard 2 so as to prevent removal of the lock housing. A bolt 12 is slidably mounted in the upper portion of the housing and is adapted to extend into the lower end of the slot 13 in which the receiver hook 7 is mounted to swing. This bolt is of such length that, when it is in retracted position, itwill not interfere with the movement of the spring 6 but, when projected, it will come against the spring 6 and hold it against movement.

Any suitable means may be provided for actuating the bolt 12. In the drawings there has been shown a spring controlled lever 14 projecting between lugs 15 extending from the bolt and this lever is held by a spring 16 against a cam 17 carried by a key receivmg barrel 18. Obviously when a key of the proper size and shape is inserted into the barrel and the barrel is rotated, the cam 17 will come against lever lei and shift it so as to cause the bolt to be projected against the spring so that it will be held by the cam abutting against the lever as shown in Figure 1. It is to be understood, however, that other means than that described and shown can be employed for actuating the bolt, it merely being essential that the bolt shifting means be controlled by a key or by some permutation mechanism.

It will be apparent that with a telephone equipped with a lock such as described, it becomes possible, by shifting the bolt 12 to the position shown in Figure 1, to prevent use of the telephone by any one unless provided with the necessary means for retracting the bolt. hen the bolt is retracted, as shown in Figures 2 and 3, the telephone can be used in the usual way. A key for use in actuating the lock has been indicated generally at K in Figure 3.

WVhat is'cla-imed is:

1. The combination with a structure for supporting a telephone transmitter, a receiver hook movably connected thereto, and a circuit controlling spring cooperating with the hook, of a lock including a bolt, and means for shifting the bolt for holding the spring against movement when the hook is actuated.

2. The combination with a structure for supporting a telephone transmitter includ ing a circuit controlling spring and a reoeiver hook for holding the spring normally 2 mo es-2 in one'position, of a lock housing fixedly mounted relative to said structure, a bolt carried thereby, and means for shifting the bolt'into engagement With the spring to hold the spring against movement by the actuation'of the hook.

3. The combination With the standard of 7 1 controlling spring, of a housing mounted on spring and hold it against movement by the actuation of the hook.

In testimony that I claim the foregoing as my oWn, I have hereto affixed my signature.

CHARLES GEAN KOCH. 

